gdb under UnixWare 7.1.1

[Adam Epstein]

  I've been trying (for longer than I'd care to admit) to get gdb
working under UnixWare 7.1.1 (running on a Pentium III).  I have a
trivial c program which dumps core by executing

  *(char *)0 = 1;

and cannot get gdb to read the core file.  I'm in the process of
rebuilding the system from scratch so that I can be sure that there's
nothing "funny" with the installation that I've been using, and so I
don't have the precise gdb error message to post here, but it's pretty
much:

  $ gdb -c core a.out

  cannot find registers from core file
  #0 0x0 in ?? () 

  (gdb) 

I started with the skunkworks gdb 5.0 binary package available at
www.sco.com/skunkware/uw7/devtools/gdb/gdb-5.0.pkg and when I didn't have
success with that, I tried building gdb 5.0 on the target system from the
source at ftp.gnu.org/gnu/gdb/gdb-5.0.tar.gz and from the CVS tree at
sourceware.cygnus.com/pub/gdb/snapshots/gdb+dejagnu-weekly-CVS-20000919.tar.bz2

I have tried letting configure choose the target, and I've tried specifying
various targets (e.g. i686-UnixWare7.1.1-sysv5, i586-sco-sysv5, etc) through
--targets, and I've tried building it with both gcc and the native (ccs) tools.

I have also tried building gdb 4.17 and 4.18 and I have tried installing the
patch in http://sourceware.cygnus.com/ml/gdb-patches/2000-q1/msg00257.html as
mentioned by others in the encouraging comp.unix.unixware.misc thread at
http://x57.deja.com/[ST_rn=ps]/viewthread.xp?mhitnum=6&AN=589539314.1&frpage=threadmsg_ct.xp&address@hidden/1&back=comp.unix.unixware.misc

I must be missing something obvious.  Any suggestions?

 -Thanx
  -Adam